The mass decontamination exercise saw the region?s fire crews put their new Incident Response Unit (IRU) to use after days of training for the firefighters involved.
Eighty IRUs have been delivered countrywide and are designed to decontaminate people after subjection to a chemical attack.
Each unit is staffed by five firecrews and houses two decontamination units, capable of ?cleaning? up to 400 people an hour.
Tavistock fire chief, Tim Smith, said: ?It is an amazing piece of kit, the IRU is huge and the decontamination units are incredible; they work so quickly.?
The Devon IRU is housed at Okehampton, but the unit and its crew are required to attend incidents wherever they occur across the country, so firefighters from Chagford, Crediton, Hatherleigh, Okehampton and Tavistock could find themselves dispatched far afield in the event of a terrorist attack.